I addressed how movepool is not quite immutable as you say it is among the same pokemon species.
And while you claim there are hundreds of thousands of combinations that we would have to sort through, that is simply not true. We are not computers. We can easily laugh aside moves such as twister, fling, and incinerate, making it far less that we need to think about. This is why people can play Go at high levels, while computers can only manage an amateur level.
And I would say banning outrage,draco meteor, dragon claw, dragon pulse, and extremespeed on Rayquaza would make him OU. He is checked by all the other dragons, who can revenge him if he SD's, and even DD's if scarfed, and would need to run ice beam to beat them at all. He has not physical stab outside of fly now, and the only other physical choices would be brick break, waterfall, and crunch. On the special side, it does have Air slash and hp dragon and base 150 sp atk, but chandelure has 145 sp atk and stronger moves. Not as good type coverage or resistances, but it doesn't ohko the game didn't it? Rayquaza would probably have a good but not broken specs/LO set with brick break for blissey.
EDIT: I now see he also gets edgequake, but he's mostly outclassed in that regard, by those who get stab on one of them, and aren't SR weak- Landorus for example.
And species is the only factor which could be said to be special among all the factors. Why? It alone is linked to a list of the other factors (aka blaziken has this movepool, these types, these stats, this abilitypool) while the other factors are linked solely to species (speed boost doesn't have a movepool now does it?).
As such, abilities and moves are both factors, which make a a total pokemon (the species and all the links of other factors it's linked too). Either they are broken alone or the species is broken as a whole. None of this DW forms shit. If you can say different abilities are different forms, you can say different moves are different forms.
Elaborate on that first sentence.
We can laugh aside some move combinations, but not others. For each of the moves you listed, if Rayquaza used that move and only that move, it wouldn't be broken. Those moves are only broken when combined with other moves to set up, gain coverage, or both. So it's never a matter of a single move, and there's no good way to determine that it's that single move that should be blamed for the Pokemon being broken and banned. If Dragon Claw and Extremespeed are only broken in combination with a boosting move, do you ban Dragon Claw and Extremespeed, the boosting moves, or the combination? If Rayquaza's STAB Dragon-type moves are only broken in combination with coverage moves that can be used to hit Steel-types neutrally, do you ban the Dragon-type moves, the coverage moves, such as Earthquake, Overheat, and Waterfall (actually, it would take sorting through quite a few combinations to figure out whether or not certain moves could qualify as coverage moves), or the combination? We would never be able to reasonably come up with a good answer for what to ban out of these, so the distinction would always be, to use your word, completely arbitrary. It would also be arbitrary if we were to ban each of those moves on Rayquaza in the first place without spending five rounds of testing to confirm that each of them was broken in isolation from each other, let alone from other moves.
And we aren't talking about Speed Boost. We're talking about Blaziken + Speed Boost, which absolutely
does have a movepool - in fact, a different movepool from Blaziken + Blaze, if only slightly. Indeed, the typing and stats are the same, but that alone does not make two Pokemon the same. The Deoxys forms all have the exact same typing, movepool, and ability, and yet right now they reside in three different tiers. The Rotom forms have the same stats, same ability, and almost identical movepool, and yet they too are considered separate and reside in different tiers. Hell, Tornadus and Thundurus have the same stats, same abilities, and extremely similar movepools, and extremely similar types, and yet they are also considered separate Pokemon. It's the same story for the two versions of Blaziken and any other Pokemon, the regular world form and the DW form. At least, in theory it is. The only thing that will make it official whether there's a distinction or not is, as with everything else, a decision from PR. We can argue about this all we wish, but we won't get anywhere until that point.
I had thought that there had been a decision from PR about this last time it was brought up, but that appears to not be the case. While several people rejected it in a discussion, there was no poll, and therefore no official decision.
Okay. Now, with that definition, how far do we go when banning uncompetitive things? Confusion, Attract and Paralysis all fit the definition of "encourages the players to rely on luck to win." Freeze and Sleep do to a lesser extent.
And we won't even address crits, or non-100% flinch moves.
Evasion items could be disputed as "uncompetitive," considering it was more-or-less a ban on a whim as opposed to "we've tested this and found the evasion boosts from the items caused a loss a significant number of times."
I am curious though, how do you feel about things like King's Rock and Razor Fang? Those two items add a 10% flinch to all moves (minimum) and can give 74% flinch rate on anything with Serene Grace and a 30% flinch rate attack. With paralysis that's 18% chance of getting to make any move.
As others have stated, Paralysis is not used for the purpose of hax; it has a far more significant purpose in reducing the opponent's Speed, and Confusion and Attract can be removed by switching out. This is a key aspect that makes them different from effects such as Evasion. Sleep, too, is used to make a Pokemon unable to act for a short duration; it's only the durartion that's random. And no move exists solely for the purpose of inflicting Freeze. The same goes for crits and flinch moves, except for moves that do so 100% of the time, which are again, not an issue. And as I've stated before, flinch moves must be used each turn in order to be effective, making them possible to counter by switching to a Pokemon that takes insignificant damage from them.
Evasion items are officially considered uncompetitive. You may disagree with that, but the latest poll has established that as official policy. The fact that no testing was necessary indicates that testing is
not necessary to deem something uncompetitive.
I would not say King's Rock and Razor Fang are uncompetitive, and I am in fact opposed to the hypothetical banning of either one. Flinching requires the flincher to move first, and there can be strategy in what move is used. If Cloyster dons a King's Rock to get a flinch rate on every hit of its Skill Link Icicle Spear and Rock Blast, it's getting a 40% chance of causing a flinch with each faster use of those moves, which is no longer hax and is instead strategy. It's just like Lava Plume and Discharge - using a weaker move with a substantially higher chance of triggering a luck-based effect, when the luck-based effect is in itself strategical and competitive.
This topic just seems like pointless bickering now. What's done is done, and everyone may not be happy with that, but you can't please everyone.
A few pages back someone said something along the lines of "if you have a problem, get better so you can vote". That's more harsh than I would personally word it, but it is essentially true. They (the voters) acted on what they think is best, and disagreeing is fine, but arguing for 9 or so pages on something that won't be changed for a month or two is just silly. Agree to disagree, and hope that you can vote for the next round, bring up the ban and justify your argument.
That may have been reasonable in the past, but not right now. We're dealing with proposal bans bans that don't have an official policy with regard to them yet, and someone who simply gains the ability to vote can't contribute at all towards writing that policy. Not directly, at least.